What causes Carburetors clogged from ethanol fuel sitting on the Honda Cb750 Four?

Idle quality, throttle response, fuel smell in airbox Estimated fix cost: $150-$400

What causes Cam chain tensioner worn, rattles on startup on the Honda Cb750 Four?

Cold start rattle disappearing after warmup Estimated fix cost: $80-$200

Spark consistency, whether Boyer electronic kit already installed Estimated fix cost: $50-$250

Oil residue around cylinder head and tach drive area Estimated fix cost: $100-$300

Known issues to inspect before buying a used Honda Cb750 Four. What to check and how much repairs cost.

MODERATE

Idle quality, throttle response, fuel smell in airbox

Fix cost: $150-$400

MODERATE

Cold start rattle disappearing after warmup

Fix cost: $80-$200

MODERATE

Spark consistency, whether Boyer electronic kit already installed

Fix cost: $50-$250

MINOR

Oil residue around cylinder head and tach drive area

Fix cost: $100-$300

☐Cold start the bike, listen carefully

☐Check all four carbs sync and idle

☐Inspect frame for cracks near headstock

☐Verify title is clean and matching numbers

Excellent if maintained, parts widely available